A5090951297- Geology and Paleoclimatology Research
- Cryospheric studies and observations
- Geological formations and processes
- Pleistocene-Era Hominins and Archaeology
- Methane Hydrates and Related Phenomena
- Isotope Analysis in Ecology
- Winter Sports Injuries and Performance
- Climate change and permafrost
- Polar Research and Ecology
- Arctic and Antarctic ice dynamics
- Geological Studies and Exploration
- Maritime and Coastal Archaeology
- Coastal wetland ecosystem dynamics
- Scientific Research and Discoveries
- Geophysics and Gravity Measurements
- Marine animal studies overview
- Paleontology and Stratigraphy of Fossils
- Geological and Geophysical Studies
- Hydrocarbon exploration and reservoir analysis
- Groundwater and Isotope Geochemistry
- Marine and environmental studies
- Oceanographic and Atmospheric Processes
- Geotourism and Geoheritage Conservation
- earthquake and tectonic studies
Newcastle University
2019-2024
Durham University
2015-2021
Victoria University of Wellington
2011-2013
The BRITICE‐CHRONO consortium of researchers undertook a dating programme to constrain the timing advance, maximum extent and retreat British–Irish Ice Sheet between 31 000 15 years before present. campaign across Ireland Britain their continental shelves, North Sea included 1500 days field investigation yielding 18 km marine geophysical data, 377 cores sea floor sediments, geomorphological stratigraphical information at 121 sites on land; generating 690 new geochronometric ages. These...
The southern North Sea is a particularly important area for understanding the behaviour of British-Irish Ice Sheet (BIIS) during last glacial cycle. It preserves record maximum extent eastern sector BIIS as well evidence multiple different ice flow phases and dynamic re-organisation BIIS. However, to date, known sheet history geochronology this region predominantly derived from onshore geological evidence, offshore imprint remain largely unknown. Using new data collected by BRITICE-CHRONO...
ABSTRACT We present a new chronology to constrain ice‐margin retreat in the northern Irish Sea Basin. Estimates on timing of ice thinning derived from surface exposure ages for boulders summits Isle Man and south‐west Cumbria suggest that was commensurate with rapid followed short‐lived advance Ice Stream (ISIS) maximum limits Celtic Sea. This Basin fastest at 20 ka response wider calving margin, but slowed as stabilized oscillated against Man. provide first age constraints Scottish...
Abstract Predicting the future response of ice sheets to climate warming and rising global sea level is important but difficult. This especially so when fast‐flowing glaciers or streams , buffered by shelves, are grounded on beds below level. What happens these shelves removed? And how do stream surrounding sheet respond abruptly altered boundary conditions? To address questions others we present new geological, geomorphological, geophysical geochronological data from ice‐stream‐dominated NW...
During the Last Glacial Maximum (LGM) marine-terminating Barra Fan Ice Stream (BFIS), a major conduit of British Irish Sheet (BIIS), drained much western Scotland and northwest Ireland with ice streaming onto continental shelf Malin Sea. The extent retreat history this stream across shelf, until now, is not well known. In particular, geochronological constraints on have thus far been restricted to deep-sea cores or terrestrial cosmogenic nuclide dating onshore, ages absent. To understand...
Understanding the triggers and pace of marine-based ice sheet decay is critical for constraining future mass loss dynamic behaviour sectors large polar sheets in Greenland Antarctica. Numerical models which seek to predict this need be calibrated against data from both contemporary palaeo-ice sheets, latter requires accurate reconstruction former extent, dynamics timing. Marine geophysics, sediment cores, benthic foraminiferal assemblages radiocarbon dating are used reconstruct extent last...
ABSTRACT The offshore sector around Shetland remains one of the least well‐studied parts former British–Irish Ice Sheet with several long‐standing scientific issues unresolved. These key include (i) dominance a locally sourced ‘Shetland ice cap’ vs an invasive Fennoscandian Sheet; (ii) flow configuration and style glaciation at Last Glacial Maximum (i.e. terrestrial marine glaciation); (iii) nature confluence between Sheets; (iv) cause, rate sheet separation; (v) wider implications...
Ice sheet mass loss is currently dominated by fast-flowing glaciers (ice streams) terminating in the ocean as ice shelves and resting on beds below sea level. The factors controlling ice-stream flow retreat over longer time scales (>100 years), especially role of three-dimensional bed shape strength, remain major uncertainties. We focus a former stream where trough substrate are known, or can be defined, to reconstruct history grounding-line movements 15 millennia since Last Glacial Maximum....
ABSTRACT Understanding the pace and drivers of marine‐based ice‐sheet retreat relies upon integration numerical models with observations from contemporary polar ice sheets well‐constrained palaeo‐glaciological reconstructions. This paper provides a reconstruction last British–Irish Ice Sheet (BIIS) Atlantic shelf west Ireland during following Last Glacial Maximum (LGM). It uses marine‐geophysical data sediment cores dated by radiocarbon, combined terrestrial cosmogenic nuclide optically...
This paper provides a new deglacial chronology for retreat of the Irish Ice Sheet from continental shelf western Ireland to adjoining coastline, region where timing and drivers ice recession have never been fully constrained. Previous work suggests maximum ice‐sheet extent on outer occurred at ~26–24 cal. ka BP with initial marked by production grounding‐zone wedges between 23–21.1 . However, rate inner present coast are largely unknown. reports 31 terrestrial cosmogenic nuclide ( TCN ) ages...
The Northeast Greenland Ice Stream (NEGIS) is the main artery for ice discharge from northeast sector of Sheet (GrIS) to North Atlantic. Understanding past, present and future stability NEGIS with respect atmospheric oceanic forcing global importance as it drains around 17% GrIS has a sea-level equivalent 1.6 m. This paper reconstructs deglacial Holocene history Nioghalvfjerdsbræ (or 79N Glacier); major outlet NEGIS. At high elevation (>900 m asl) autochthonous blockfield, lack glacially...
Abstract An array of information about the Antarctic ice sheet can be extracted from ice-sheet internal architecture imaged by airborne ice-penetrating radar surveys. We identify, trace and date three key reflection horizons (IRHs) across multiple surveys South Pole to Dome A, East Antarctica. Ages ~38 ± 2.2, ~90 3.6 ~162 6.7 ka are assigned IRHs, with verification upper IRH age core. The resultant englacial stratigraphy is used identify locations oldest ice, specifically in Byrd Glacier...
ABSTRACT New optically stimulated luminescence dating and Bayesian models integrating all legacy BRITICE‐CHRONO geochronology facilitated exploration of the controls on deglaciation two former sectors British–Irish Ice Sheet, Donegal Bay (DBIS) Malin Sea ice‐streams (MSIS). Shelf‐edge glaciation occurred ~27 ka, before global Last Glacial Maximum, shelf‐wide retreat began 26–26.5 ka at a rate ~18.7–20.7 m –1 . MSIS grounding zone wedges DBIS recessional moraines show episodic punctuated by...
Abstract. The analysis of englacial layers using radio-echo sounding data enables the characterisation and reconstruction current past ice-sheet flow. Despite Lambert Glacier catchment being one largest in Antarctica, discharging ~16 % East Antarctica’s ice, its architecture has been little analysed. Here, we present a comprehensive Glacier’s collected by Antarctica's Gamburtsev Province Project (AGAP) North survey. We used an “internal-layering continuity index” (ILCI) to characterise...